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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Earning assets |  |
Accrued interest receivable | $ 115,206 |
Accrued interest receivable, difference |  | $ 93,861
Tax indemnification receivable | 93,489 | 41,570
Total earning assets | 2,400,951 |
Total earning assets, difference |  | 2,152,077
Interest-bearing liabilities |  |
Long-term borrowings, difference | (61,476) | 5,373
Total interest-bearing liabilities, difference | (168,713) | 63,304
Excess of net asset fair value over carrying value | 2,232,238 | 2,215,381
Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits, difference | (19,916) | 19,151
Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits, difference | (87,321) | 38,780
Fair Value |  |
Earning assets |  |
Cash and cash equivalents | 3,998,514 | 2,559,106
Available-for-sale investments | 331,541 | 176,245
Accrued interest receivable | 1,516,824 | 1,285,842
Tax indemnification receivable | 38,925 | 39,207
Derivative instruments | 772 | 2,090
Total earning assets | 31,440,967 | 28,391,625
Interest-bearing liabilities |  |
Long-term borrowings | 4,924,239 | 4,278,931
Accrued interest payable | 68,379 | 61,341
Derivative instruments | 359 | 2,032
Total interest-bearing liabilities | 26,276,236 | 23,226,455
Fair Value | Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits | 9,803,941 | 9,370,957
Fair Value | Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits | 11,479,318 | 9,513,194
Carrying Value |  |
Earning assets |  |
Cash and cash equivalents | 3,998,514 | 2,559,106
Available-for-sale investments | 331,541 | 176,245
Accrued interest receivable | 1,401,618 | 1,191,981
Tax indemnification receivable | 38,925 | 39,207
Derivative instruments | 772 | 2,090
Total earning assets | 29,040,016 | 26,239,548
Interest-bearing liabilities |  |
Long-term borrowings | 4,862,763 | 4,284,304
Accrued interest payable | 68,379 | 61,341
Derivative instruments | 359 | 2,032
Total interest-bearing liabilities | 26,107,523 | 23,289,759
Carrying Value | Money-market and savings accounts |  |
Interest-bearing liabilities |  |
Deposits | 9,784,025 | 9,390,108
Carrying Value | Certificates of deposit |  |
Interest-bearing liabilities |  |
Deposits | 11,391,997 | 9,551,974
Private Education Loans |  |
Earning assets |  |
Loans held for investment, net | 2,214,696 |
Loans held for investment, net, difference |  | 2,018,576
Private Education Loans | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 23,609,477 | 22,313,419
Private Education Loans | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | 21,394,781 | 20,294,843
FFELP Loans |  |
Earning assets |  |
Loans held for investment, net | 11,659 |
Loans held for investment, net, difference |  | 11,296
FFELP Loans | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 824,687 | 859,185
FFELP Loans | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | 813,028 | 847,889
Personal Loans |  |
Earning assets |  |
Loans held for investment, net | 59,390 |
Loans held for investment, net, difference |  | 28,344
Personal Loans | Fair Value |  |
Earning assets |  |
Loans held for investment, net | 1,120,227 | 1,156,531
Personal Loans | Carrying Value |  |
Earning assets |  |
Loans held for investment, net | $ 1,060,837 | $ 1,128,187

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
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